Fix build command

Author: bhch

package.json

@@ -10,8 +10,8 @@
   "unpkg": "./dist/react-json-form.js",
   "scripts": {
     "build": "npm run build:uncompressed && npm run build:compressed",
-    "build:uncompressed": "microbundle --format umd --no-compress",
-    "build:compressed": "microbundle --format umd -o ./dist/react-json-form.min.js",
+    "build:uncompressed": "microbundle --format umd --no-compress --jsx React.createElement",
+    "build:compressed": "microbundle --format umd --jsx React.createElement -o ./dist/react-json-form.min.js",
     "dev": "microbundle watch --format umd --no-compress --jsx React.createElement --output ./dev/dist/",
     "lint": "eslint src"
   },